CVE-2024-44940 (GCVE-0-2024-44940)

Vulnerability from cvelistv5 – Published: 2024-08-26 11:20 – Updated: 2026-08-05 11:37
VLAI
Title
fou: remove warn in gue_gro_receive on unsupported protocol
Summary
In the Linux kernel, the following vulnerability has been resolved: fou: remove warn in gue_gro_receive on unsupported protocol Drop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is not known or does not have a GRO handler. Such a packet is easily constructed. Syzbot generates them and sets off this warning. Remove the warning as it is expected and not actionable. The warning was previously reduced from WARN_ON to WARN_ON_ONCE in commit 270136613bf7 ("fou: Do WARN_ON_ONCE in gue_gro_receive for bad proto callbacks").
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:27 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7067 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < a925a200299a6dfc7c172f54da6f374edc930053 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < b1453a5616c7bd8acd90633ceba4e59105ba3b51 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < 5a2e37bc648a2503bf6d687aed27b9f4455d82eb (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < 3db4395332e7050ef9ddeb3052e6b5019f2a2a59 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < 440ab7f97261bc28501636a13998e1b1946d2e79 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < dd89a81d850fa9a65f67b4527c0e420d15bf836c (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.107 , ≤ 6.1.* (semver)
Unaffected: 6.6.47 , ≤ 6.6.* (semver)
Unaffected: 6.10.6 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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        "vulnStatus": "Modified",
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                "value": "NVD-CWE-noinfo"
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            "source": "nvd@nist.gov",
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    },
    "redhat_vex": {
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      "current_release_date": "2026-09-13T08:43:04+00:00",
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      "initial_release_date": "2024-08-26T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fou: remove warn in gue_gro_receive on unsupported protocol",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-44940.json",
      "version": "3"
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            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
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                  "content": {
                    "id": "CVE-2024-44940",
                    "options": [
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                      },
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                      },
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                      }
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: remove warn in gue_gro_receive on unsupported protocol\n\nDrop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is\nnot known or does not have a GRO handler.\n\nSuch a packet is easily constructed. Syzbot generates them and sets\noff this warning.\n\nRemove the warning as it is expected and not actionable.\n\nThe warning was previously reduced from WARN_ON to WARN_ON_ONCE in\ncommit 270136613bf7 (\"fou: Do WARN_ON_ONCE in gue_gro_receive for bad\nproto callbacks\")."
            }
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                  "value": "AV:N - The warning is reached from the NAPI GRO receive path (`udp4_gro_receive` \u2192 `gue_gro_receive`) while parsing a UDP datagram arriving from the wire on a host with a FOU/GUE tunnel port, so any remote host that can send a UDP packet to that port triggers it.\nAC:L - The trigger is a single stateless, unsolicited UDP packet whose GUE header carries any `proto_ctype` lacking a registered offload handler; the commit itself notes \"such a packet is easily constructed\" and syzbot generates them, with no race, memory-layout, or timing condition involved.\nPR:N - The GRO path processes the packet before any authentication, authorization, or socket-level filtering \u2014 the FOU receive socket is unconnected, so an unauthenticated off-path attacker needs no credentials on the target.\nUI:N - Processing happens automatically in softirq context when the packet is received; no action by any local user or administrator is required.\nS:U - The warning and any resulting panic occur in the kernel of the receiving host, entirely within the same security authority, with no crossing of a VM, container, or IOMMU boundary.\nC:N - Control flow after the WARN is identical to the fixed code (`goto out`); no memory is read out of bounds and nothing is disclosed to the attacker, who cannot observe the kernel log.\nI:N - The bug involves no memory corruption or state modification \u2014 the packet is dropped from GRO either way, so no attacker-controlled data is written anywhere.\nA:H - The attacker-triggerable WARN_ON_ONCE becomes an immediate kernel panic on systems configured with `panic_on_warn=1` or a `warn_limit`, a common hardening/crash-dump setting in production, cloud, and Android fleets, allowing a single remote packet to take down the host."
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        "cveId": "CVE-2024-44940",
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        "dateReserved": "2024-08-21T05:34:56.664Z",
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}



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